CRP and sarcopenia: For sarcopenia, the RCS curve (Figure 2B) identified a cutoff at log CRP = 0.531 delineating the plot into two phases, with sarcopenia risk decreasing steadily for log CRP < 0.531 (OR: 0.67, 95% CI: 0.58–0.77; cutoff point vs. starting point of Plot Phase 1) and increasing gradually for log CRP > 0.531 (OR: 1.79, 95% CI: 1.51–2.12; the end point of Plot Phase 2 vs.